问题
选择题
He ________ his homework at 9 o’clock yesterday .
A. does B. was doing C. did
答案
答案：B
do one’s homework是固定短语，因其主语是he，第三人称单数故其谓语动词要用第三人称单数。
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He ________ his homework at 9 o’clock yesterday .
A. does B. was doing C. did
答案：B
do one’s homework是固定短语，因其主语是he，第三人称单数故其谓语动词要用第三人称单数。